Renesas Electronics America Inc. v. Monterey Research, LLC

Background

In April 2024, Monterey Research, LLC sued Renesas Electronics Corporation in the Eastern District of Texas, alleging infringement of four patents. Renesas Electronics America Inc., described as Renesas Electronics Corporation’s wholly owned subsidiary, later filed this California action seeking a declaratory judgment of non-infringement concerning the same patents. The California action was stayed while the earlier Texas action proceeded.

On March 27, 2025, Monterey assigned all four patents to MR Licensing LLC. The assignment transferred to MR Licensing the right to sue and collect damages for past, present, and future infringement, and Monterey retained no interest in the patents. MR Licensing then filed a new patent-infringement action against Renesas Electronics Corporation in Texas. Monterey moved to dismiss the California action for lack of subject-matter jurisdiction, arguing that the assignment eliminated any actual dispute between Monterey and Renesas Electronics America. Renesas Electronics America opposed dismissal and asked the court to substitute MR Licensing for Monterey under Federal Rule of Civil Procedure 25(c).

Jurisdiction and substitution

The court held that an actual case or controversy existed when Renesas Electronics America filed the California action because it had been charged with infringement through allegations concerning Renesas Electronics Corporation and its subsidiaries. But after the assignment, Monterey no longer owned the patents or retained the right to sue for infringement. The court therefore agreed that no case or controversy remained between Monterey and Renesas Electronics America.

The court nevertheless found an actual case or controversy between MR Licensing and Renesas Electronics America. MR Licensing’s Texas complaint alleged that Renesas Electronics Corporation and other defendants infringed directly or through subsidiaries or intermediaries, and alleged that devices sold by Renesas Electronics America unlawfully used patented technology. The court concluded that these allegations placed Renesas Electronics America in the position of either continuing conduct alleged to be unlawful or abandoning conduct it claimed the right to pursue.

Rule 25(c) allows an action to continue against the original party or permits the court to substitute or join the transferee when an interest is transferred during litigation. The court concluded that substitution was appropriate because a controversy existed between MR Licensing and Renesas Electronics America, substitution would avoid requiring a new case, and the underlying dispute concerned the same four patents. The court rejected Monterey’s argument that substitution could not cure the jurisdictional problem, relying on Federal Circuit precedent stating that Rule 25(c) permits an action to continue after an interest is transferred.

Service

The court also rejected Monterey’s argument that Renesas Electronics America had failed to serve MR Licensing. The court found that Renesas Electronics America had attempted to serve MR Licensing’s registered agent at the registered address, had been refused, and then properly served the Texas Secretary of State under the applicable federal and Texas service rules. The court found that Renesas Electronics America had acted with reasonable diligence.

Sealing motions

The court granted Monterey’s motion to seal Exhibit A because it contained confidential business information that could be used for improper purposes. The court granted Renesas Electronics America’s administrative sealing motions as to the content identified at Docket Nos. 43-3 at 2–3 and 45-3 at 4. It denied those motions as to the content identified at Docket Nos. 43-3 at 4 and 45-3 at 5 because that material supported Monterey’s dismissal motion and disclosed only generalized information about the parties.

Disposition

The court denied Monterey’s motion to dismiss and granted Renesas Electronics America’s motion to substitute MR Licensing for Monterey. The order also granted Monterey’s motion to seal Exhibit A, granted in part and denied in part Renesas Electronics America’s administrative sealing motions, and disposed of Docket Nos. 39, 40, 43, 45, and 46.